Using Operator in Atom

styles.less

atom-text-editor,
atom-workspace {
    font-family: "Operator Mono for Powerline";
    font-weight: 500;
    line-height: 1.9;
}

atom-panel.tool-panel {
    font-size: 0.88em;
}

// This is a comment
.editor .comment,
atom-text-editor.editor .syntax--comment {
    font-family: "Operator Mono for Powerline";
    font-weight: 300;
    font-style: italic;
}

.syntax--attribute-name,
.entity.other.attribute-name,
.syntax--control,
.syntax--keyword {
    font-style: italic;
}